Masteries

Offense:
21

Defense:
0

Utility:
9

So this build might not work out for everyone but it usually works out for me. I usually start in middle lane and harass my laner with blinding shot. If you want to get a kill on him I suggest camouflage near the turret and letting him push, when he gets close enough ignite, exhaust and let loose :)
I usually pick boots of mobility because it helps me get around the map quicker for easier ganks to stack up my Soul Stealer but whatever boots you want to pick might work as well.
After you get your MSS start working on the team ganks and work on the snowballing effect that will make you a huge pain in the enemies hide during the rest of the game.
I suggest getting the Crystal Rod ASAP for the slows on your blinding darts AND your shrooms.
After that it's pretty straight forward on stacking AP though if the other team seems to be getting fed I usually pick up a Banshee's Veil.